Type Alias TypeParsableBuffer

Buffer for rectangle can be:

• number: left, bottom, right, top buffer all the same
• [number, number]: left/right and bottom/top buffer values
• [number, number, number, number]: left, bottom, right, top buffer values
• { left? number, bottom?: number, right?: number, top?: number}: object definition where default values are 0.

Can use getBuffer to convert the parsable buffer into